SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c152fda3d9201603229fbb11ab7341f8176395bbd92f4cb8634d3c305d6a7bad' 
  AND token = '/PXHiPgby5vxHsqgBGZwS7KZ7ikB6Qd+6lHjqOz/KVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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