SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e2223976f24f10f411b4eda0ce99962444320b0caefdf8c53b868954f19360' 
  AND token = 'xKJOHDJxQX25/ZD1+/UctiaAHFROlBbkJhLKZz8Sl7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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