SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810dbc791275954de3c57253923785aee0b5cc3c83b933f8e963e3c923d574cd' 
  AND token = '/TPHgwjLl4KqHpJYCFkesXNHrCYmrkRn0hjDwgf6Row=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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