SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cf21f253f2d8cef62099b83adf3e34cbdffa92b7c66aad10275af0d7b1ad59b' 
  AND token = 'GGQ7bSRDHkXhFVNhc9TL/SjsD+ptKb130/uJzuUCxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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