SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d90ea2a79eede7852fc902a330d39d9beac95f9749050cd161db1e6c4faddc' 
  AND token = 'ihYGc9gP20VK/BqkEMf7qLKI1LiEh75BZfZmY5oE2dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

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