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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6e73dd845b796c04ea3a50169614f9bca57373e8c86c8a7c79e31b5eb63f3f' 
  AND token = '6guiRTOWakI1kmp9ojdm7UEJ33ge4DwlFJRxsen64GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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