SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6048f7029aab6161ed771d73f94969647ea9b944d7c6e933651f5f790d448ce0' 
  AND token = '+06wdVwZVkyA5vKh9FoT+zj3gDU8B9rUoo2Buj7CI+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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