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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b603a173a4fab8bb6a15feb3422eacc1fd23c7dbd5b8c09dd5822b6199b3d3d' 
  AND token = 'sbvztbJ/zONV59zwsAcPUD09x/92nqZu9FPnDVc8ShI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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