Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5adbacf4a27dc011600b03b0c23e83238c75e117d3ae4041ebda2cbdfe61d439' 
  AND token = 'JSY87fTKFCghFTfdO5vYJ1ut7IlIY2T8F5WnknjES28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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