SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c17c9ee903e3167db5994f3631206e6292bfb10859c2347beb81fd9152d88b' 
  AND token = 'miK8SJeN9OjVBtxN+e9cY02z8gihMvfQFZ4DwyAsX8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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