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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d50b4afef703d9a839c3dc6ea85f12a2e3c65d90b26b4f1a229c8ceea794203' 
  AND token = 'QQMwayIf9h1hiq4EvRN1POTwnLHe34ifyjtgv3DNS/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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