SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516d17a8cf87843b22824ab0d681ebe81ae488926d91d6cd6f9fb8c5aff557c2' 
  AND token = 'zGe/QRj+LqASEBRn7InJYNmS2c991PJkjzKs7NO36us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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