SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cdfff9c16286c03593a6d3612791c3cb4892572752442df31e9910c9b1ab85e' 
  AND token = 'n0cVf9p+qTibeFnpBVUtEQIURtzdGlayI8/muKyIYhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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