SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb317c2b87bd2f72ca3c6ee4e9e06a8f6e61863023463928db795539b9783bc9' 
  AND token = 'RC7EYwwgkjLziqIbnKpKW6Gcs06f5RWS34B7L+J7rZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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