SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f797b905a53713b17a92b32944c769efb182cfb74cc21fb869c9114b940e1b72' 
  AND token = 'rtJghw5QKQgnLgSvF4m6H5fKWLiSJqvMIXUzGHAX5/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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