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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4c061b8809d43a8591db7131dc04aea9b1a031c08b09f67eeabc56393e90e7' 
  AND token = '5WBPHbUUiQXpe5Xne7LjVp/4JMYnrQJBnAxH6WcFigU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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