SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6322fc7ad642ebe6c0d8fc0d468f0977104d270381577ea669084db73060cb08' 
  AND token = 'aHWGvQNbh/ljH1jbrp3w21xSqCnxLLzzQuwR9jX+1JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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