SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917a62823ee8c6601f0b095642a5d797e947dcd8444535cead5e074150053bf0' 
  AND token = 'Cmpc1M7Zgt/wDdeV0FXPuymuXjp/nJpHvlk/6ZMKB/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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