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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6afdbc697355fbffe3e2e78057170c3a066ed61bcc161f7c4ddbbd1942a4fdc2' 
  AND token = 'cFnlU6cH5I9Vo8jbuG6ITR+8X8rR3fO6A9Thz6P6jKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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