SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f12ef26d723c1f5de839f1e30ff36f2d8e5713681745299a26a8b3e8fc8ee4f' 
  AND token = 'khpR6hVGqrZUuX8jomz9BM+KJSpGiBTzcrRv5jJsveA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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