Sorry for replying so late, I did think that the keycard may have been a bit hard to find when I first submitted it but I didn't end up having enough time to add anything to fix the issue. To find it you need to go to the snowy mountain area and there should be some paths around that will lead to two wreckages. One has the keycard and one has the terminal you need to enter the keycard into. If you can't see the paths then wandering around a little bit will eventually lead you there, it's a pretty small biome anyway.