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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915b4c36e38cce29d5862447018e03f1265cc2a3ce54ea9efe204efa7a0b04a3' 
  AND token = '31+cFa3WCM+WC8XmVQBUOLQvpU9guRe8G7FfXtNR6Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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