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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4532b5a885c4e128023f18d10f96d55651b6b132881149dbf33568d3f057c516' 
  AND token = 'U8xoegUTe/fZdMXqJZe1rkExfhXjBENGqcGh8jElB8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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