SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e09827174f9470fe4d7b9a91a57549fe66308da3fc06cbf585b691301682d95' 
  AND token = '8h0KDYEBSrXWfJb/+0HgxoAeNyWR38SzvVTmgTY9p70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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