SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6809b4634db211a3389542ffa501367f57ac10e8d9d3f467e5fffe0c14405c' 
  AND token = 'Ln3KgAEyCNZ2Ir18I6pWDxVsZY9+SKKVXX68zCZUBiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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