SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced55f3b5bbda935340ce9822a32c3725df09cf7e451c4552e0d7c13b55a22b6' 
  AND token = 'P5ZQEN4NJP+Co/Y8KhODVm3WsBZnkjD/paLT66hQ7U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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