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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd02281708172c0a466df7313c3a24af36424d5209ad67eaf9536bc7a33a912' 
  AND token = 'M7T/TOcHdvlNirQqKj1C7O3gCMKVba6Qp8u+7yahhhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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