SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c5e46ee0d1e46550828a8fc7dec48f03a33cb60869b9537629f2f7f0807ca4' 
  AND token = 'AjFLP2BwLHMVHDqYEjYtdFkCxqR/5+cx75OhoQZV12A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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