SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab09a36ae895439a59cd10e6092f1a025a496b8e555d3094d73757a972f8c8f8' 
  AND token = 'pRELIPYW/myJYMSaBumqRV8aozSrT+nQMv1g/sh33Qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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