SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d95aef648c6e616436a72e7fc2f9c3e714b706241cf91358126994ab36daebd' 
  AND token = 'xmEhx+NVveG70FuYJ9XlM31jpSQz7MXIDEFKkXFkGVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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