SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40785869f87e2f3ec6d11450f3058b632c87dce5696d1f4f334927473418c39' 
  AND token = 'Z6vAfY9qk9/DiSWmCMM9RGbu+GDx+BsOn6wpy3x5cLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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