SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36791a62f7bb21ec84680a7958018c2b8f236a6179c147fa0006da38494c5a85' 
  AND token = 'OQzlZntxbP9s9uEQdBNkpvZeMKgJ3jrfS6Kb1ZAqwUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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