SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04daa4717f3d47b2fc98e9189fb629a853b291d075234d6cc424e7b3b518329f' 
  AND token = 'bqKQi6HHt0epMKQzI7q6vjTSayDTklyGMlGDyFlig+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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