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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '767465388b9432699e513c8dcb268795f7a08e5d6283a13e3bc7d305445d58ce' 
  AND token = 'v1JCm4La3QTr8Eq3AmjIMM0sN5XM/EbNHc2TVEjeUYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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