SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b869704240bf0f52e2ad96d45d6c25a112209c8fa220a74af43d7c52e7b1cb' 
  AND token = 'MzEqTRJj0rFMzfjclZYyRUECnuyZXVlUc8oLdQKjb/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

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