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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67541342797f3e3c3813988c514c8ea9b96e36bfba3704f260da038b0bbff3a9' 
  AND token = '9u2hI6UbCjgr1lSIsvKZAYxiLP5+sEY8tIfjdUt4bTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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