SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a99ab07c432819b090ed150a871124523864c3d44dc5a48670a5f49795cec4' 
  AND token = 'd/zQGjBi0MVInDyfvluBwMdxwcCAyotGkbOzgZjjBeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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