SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f65f110e45b42e1b436545419a77c98694e767a058df96d26f6a5139d054eac' 
  AND token = 'FvroigzgslZxh077Hwz/H5mhide6F3uMlIHhkjU5+7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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