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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5822ac9405635d4f7849b42768eefdef6d89eb634741f1b34c464ea9031da08e' 
  AND token = 'mNULk4Eu32AdlOoxdnp/5bfCRWKTXz4UzU89l2lzz0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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