SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e41c88529f558b121faa95fa642ae0ccc24a5e9be9690d0ad72183a8372ab9a' 
  AND token = 'oHGIwNRIVZSKrzIhwWLY0McZvDeZwKtEC+/SUxIXJSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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