SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad86ec81648e6d0e1262b91f81144b15253be7e73731ad55253c3b07fab8c10f' 
  AND token = '7+YIzAjpapGGw/htgVhAJcA9jUxHPVW9NPUbcJxwvCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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