SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ad7edc3a447c21d2c9b4962f11341663cb65861d2e31affc1c4551016b0fec' 
  AND token = 'Pl5Q29dPHgRoxnW0NbtvwUyMqmLGmjK7ghHXJLsj7go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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