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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845d99a3e59e5aa8827353dca29561673a03f53858d97ed1258b2834048f7cb4' 
  AND token = '55j1aQ2cEHV4XqAVhfbOG3YtKfDCJcIHr5669jDAcdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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