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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bce45641a39f9f0ef9ace8a3939d8c0ce5a69e3157eedad6a2adcd4a1955a3b' 
  AND token = 'ttBdU+48W8QltiPSE9YKgbbu04TzjdhDujOTLlg3VjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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