SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5469bdc134b4b1131f9f1c373edd3222e0922f758e94f2eac34625fbe3863b48' 
  AND token = 'hhFaw3u261T9JFPXBTIwWHQ0VxE2mGaQpYQ+HWnPK1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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