SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e7298fc76b91d075acec1e6c2a043b6a82b6df697e4a282b8200793f37b9cb' 
  AND token = 'YiGDhL9zMUVao8hbOzvzuwUq45J6R4/U4VIQbCpFXbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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