Russians hit the jackpot, check it out
(twitter.com)
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Finally had a chance to ask that. The lens is covering the heat seeking sensor, which depends on infrared light. Regular glass would not be transparent enough to infrared. Pure silicon would be more transparent, but would block other wavelengths. So if they are dark like these, they are either gallium arsenide or zinc selenide. Both are valuable and can be recycled either as lenses or raw material, but of course after it hits the target, there isn't much.
Actually, most such missiles fuze (detonate) at some distance from the target (forward and laterally), in order that the cloud of warhead fragments would have a high damage probability. The miss distance is almost never zero, so the best option is to accept the miss distance, minimize it, and design the warhead pattern accordingly. There are also differences in warhead design strategy.