SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c63c83d1581fc647c42fbc01c4d77d592a329376f9c3c9670ac7028a32ce3bb' 
  AND token = 'Uu4VuVqvZCtd3wlFWiBgvu7dv+KB9UwlolLxYHfG6t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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