SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0343f6617ea2cc6e27756498f4dd4fe218c1bf0bcbe8efceb85e797e4f2f54' 
  AND token = 'hzaAaFznqiToER3BV/3ez/vCP2ppU3tCJI6LZUpLjXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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