SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba01b38177e5091623cc4dce2f147c795eed777c778f25dc2d968969a0019ff' 
  AND token = 'SpdU+hgO9wGd6WX/5d6l4eSO8WuvPv/fizaqGKWjIs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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