SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd645244a67d8c8c3905b00775143d0bace8f852c9395a34efcf3d722eaf179a2' 
  AND token = 'rBOYnhgIQtBC3AyjzCB+lzaqQ2ZYLvRbgxmRxmru0wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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