SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd012692f562121de1325293d13db14aee6ebc589ff197c18a55caf7a0a3173' 
  AND token = '0vdI3Cy/i0cVKVIKBdTxNJX/7+DsSVy/4f+j5vbAWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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