SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e5f0cf11c9e5e14736d3c59850626ce99c66d6f0c7e874dc93b6c8f39213ae' 
  AND token = 'EKAazz2j1wpJnAjFgfrpPRG+gqn7I2GJFCX/nwPneXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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