Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee69eeb830f0a01299e42fd4ec756ad1eb1e80b95762e5d68f60915b6def82b' 
  AND token = '0avRna/9d0yDF+FS1M+xcK3uS9xZ4yDpKadLs08VAog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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