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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05407d8da3e8a4f545ae76be8826d53a5dc49b60fcb1621b92ead8aa151455ae' 
  AND token = '0dZbOXZ0GoBQBgyi0ZoxhNz91Uay0YCVl+cOc4tm7Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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