SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c97325438a0af8fde34b886ef22e068b0d6ddb9a1a562223fa668b74c77cf8f' 
  AND token = 'kCgMjaFjEVsot/QS1hhEkg8gvqD3Op86MzKyQwA3FZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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