SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b69fbb6b01b893bd8d9455d6dd0a32b622629fd5c058d7c71fb15f9288422f' 
  AND token = 'un9Tkw0Wzs5zXGbY/NHUAVwK1R4fylkwEATT6h5hCYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

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