SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb86f3c14b71d421482eacfd4c3c9a1295de0fc4bbe6d050eb960f2c73b8fb4b' 
  AND token = 'saATW197og5phgWkjb7yAI7Ai13eQI/ih2ahl346SPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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