SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bdbd284f7463005a2076f4aa84c1a18c87e3afabc17e9e1c8d33504b6414c0' 
  AND token = 'UPjNKDbo5HXYdOwzpKCPoRrYgBh7+Ym+2BGpbX/tw8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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