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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd72eb84ff0a7fa35cefd6534fecd4845df3453743c2b88670508172f1dff58' 
  AND token = 'XQo7GA4PV/pO05BSxJBuzPY0+gpC2flr71GxI7OyV28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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