SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a090aa319347fdd6c6f482b0583faaa35b5662969dac7f9949d400cbec8ba734' 
  AND token = '4ZKYilJGA7bRDHGqY7N9tbXjBzyq0M0XVxc/F6l+EBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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