SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f24c0f9db4c3104e974efa7ade59a5ed3289c7d9615b17dc20acd52c806d9f' 
  AND token = 'u/UwzMqyIfuoApCivqI/QoaIcqjJGJK6tmJhtriKsS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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