SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '852008ee960c049579f3330bdc629bb51d7c101228b989d7c3d2cadb05d65d90' 
  AND token = 'cFn81T7Zu2xEtgpXFZ+GZz+YVhxW6wHwIINlABwCDrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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