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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f74c37a69841518373d63d33404a072c9bca61ca8b0eb6497a4dcae52dd63d' 
  AND token = '5zBKAjR6mPDmcCbbVVr6sW9PhObWCfELrxGf4UQ2WdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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