SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ef8c2724a671dd5d45d15c397e1997ddab133e9ab46154161e5068f6fa7398' 
  AND token = 'wVem6+hHxjo/+IWjQx/vQgNSsVcubuwpAUd2M+ijbaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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