SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b175455826b5d75ff0466a93f17dd6e0467df4e73b92aaa844d27c39d802194' 
  AND token = 'ycEvxmsGRJrFpiyF6Vb71TqCHdz7B72rKhTCiCOht8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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