SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8466e38c24da3695278004a560a8bb0480435fa1aef592ce8f476c4983d33338' 
  AND token = 'GvzMv5BQojyiOWgBbKbYRo5KAewL6SjZuIOVK/Y6iUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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