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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc42024a71f93065ec9d02c32a8d223751decd83c9323381e965c73b47a591b' 
  AND token = 'd9Mye7ExcYiWwskmnvi8RAPpOI3PXwWO6yofRfmaWAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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