SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053415cc82ec9da61d45dd7bd6adff4c877e3d9995572792a78b9c835796e95d' 
  AND token = 'vd2b5BjLkMaTfIs6BvVoDemqwrnlx3OQQJSVhZt1gPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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