SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eadb5b4f34ad88cfff28636f22360148e92005c9f374d797b7624b2d3c6dba0' 
  AND token = '3YKLt0/vlNLjmfaQl8PqFa8UT5nGbZIqWN+SVS1Izls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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