SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfd0c28cc6d9bfb8261ba9baaa77ffb9a655e5c193c2f3d93ae1c6c2e6c4e41' 
  AND token = 'fJBVJgApFL4Kd7qt+zUsl8Rh4kCmo/sX/TEdWIq9IPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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