SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95dc837c3486da3673b6b494471ab8a28ac11267328e6ad34e70a471e53688f' 
  AND token = 'C4DaRK67lEig64WyK70XbUCBJlRIpUFscziD/KrQq2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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