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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1748b0796a0ca60267cf3272019533de5a0bf619ca5c67c9c2894fb82678f75f' 
  AND token = 'wJPCVgrel9Z/yu27BErUMe/n7HITZTDkiOyOO+ryUiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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