SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddad7e960fe73b88483b03206a53e577f589916b76ef6816d040a514084ceb8' 
  AND token = 'kZIUMHA3ZVnEh++v/hw7v/zFiyLlU7QHE1E7KzI3OLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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