I like everything you've done.
I love the stylized S and font for the lettering.
If you ignored tying the key to the S, is there a way that you feel you can incorporate the key next to or adjacent to the writing, but still have the logo feel 'balanced'?
Yours is my favorite so far and if I had to choose today, it might very well just be your text without any key at all.
Thank you, thank you,