SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1804a9d5d10557159a1fa67302b8028039abc092b683b24ea081aafc7ad77f4' 
  AND token = 'PHuQiDWNuMpzF2+j6NRhWqNzagr+YnF8rqxiOHwqILc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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