SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f301519bbccc54122d5e99a15a86ceedaeaadd3fd389113d9fb2949d223f63' 
  AND token = 'ouO2jWBqLw/CAJbmTqVoKqYGvmtC3ki9WzNu3LuwWLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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