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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e50eadba0d693a79e8a5a045863ef83c77e9f4582fcb551770a4e28cb82b371' 
  AND token = 'LQLwn8u9JRTAQMiJF/a/GDE8Bu/nZ75EJHj5mpL36Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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