Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f38afb5be7489dfe77f0e3d7474fd70cfa5585f23c08117bda1aabee97748e' 
  AND token = '27QDPHraRXql48fL8CWhPz2XOscXzmq+7Pkqt1CigSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}