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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36018e68f7819aaff65006ef40e3f093b7ecf622c3405e33ed8d866a5d048f3a' 
  AND token = 'ngE7UPAFyNwRCVK8pbXOuRKjrVBLa86Iyz7HYOjxyPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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