SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f053eaee5b5671b49c1424da0f283e44a6190c660d19fa983e3d1dc7c074fc' 
  AND token = 'jGvV+s68wlVpT1GtFBRYG2mimaY/aYRVjRQ28Z+XK/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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