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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87bbf37daa4b02490515bebacdeea229f71e653927f80dd6445f8b13792acedf' 
  AND token = 'kaG6jwf5jlJDDJNdK6npMsIm0hWIhfpGEv8zAT0XlvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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