Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0eb0f23f1c4084c29f08c96d5d4967d1fa2d2fe7b6e45007a171516ba4a8f2a' 
  AND token = '7DykiqqTKtveduJZ+d6HFQA4mqadKVsaK6CYqMf2wMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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