SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d9ffa83825d50c6c2ac8fdf21aaad97fb7bc5e9b25284b2b32e527aa6ec9a6' 
  AND token = '7bZ/XD15m8pyGeaSFxc0gpoCMhBwR+leqOzNOawXucg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables