SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545c80feada17af41a0201623335bd45875cd80b328ee6ccc282d5a4677a23d8' 
  AND token = 'WzA8P54ai8KRmXhO6POwr9QqxZX9Y4xJVgSEouVpgLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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