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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600e1a87a72b8d6afc7fe929b9cb18009ceb675a0c2cefc14ab96d14d7791ae2' 
  AND token = '2tiLb2+627QEX+867+ReLQQyXQybnc/WEkV7E6KNCuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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