SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5da22098a38df6df8883b8a4edb3dc63bbb300f8cd64b7573e2e0db63039ce' 
  AND token = 'MIJQ8aYLTM1ovhTB6X/gxBgHrAUlnNzEeWGwKFVR2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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