SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223c6320a6cea65b12b26acc8133c679a562a7f97a4dce5f8cb1dbc8b7464ec0' 
  AND token = 'J+du5MgJ8xWVnIpGGuL7lyKj/B61UzOv8kcfVgwC/LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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