SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66099561d441fc7ab0e0971b8e3b0fe7a30bfd88e372788947412beb722fa8b4' 
  AND token = 'lgHVjfK7MtvwKRyhXTjjENm+ikR/EziYU8blA+NZCFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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