SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89099ccfec6242cfd8dd20b9c85eaaf4b04017ba29f55bf82bb5ce4c03672ab5' 
  AND token = 'IBLlcappYIZGB5h6zQYvB3G/XvaJiX/UZXFCarvlOBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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