SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beaa9c75ffb586d8cbad7185360feca0e1a74772372aaf8d8ccaeef35bba1ffb' 
  AND token = '+30mHfGYYhz0FduHwiptKGNT2PjDyQwIYRIIJGVqKBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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