SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106f2893f59f4df35cca289c0102c24bb5f76724739e92fa494e8737805dcbb6' 
  AND token = 'V+daeNzhqdX5HkYbAmQFva+/R915JUSCc0WVOPo34uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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