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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4df1fe5611e4a6e66ad851895f93dd453159392e41b1ccc28bc2b934adf948' 
  AND token = '0JMEduZbM5jFOmP31kx7S2iqTsHB9T+Y6gn6K7hVNds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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