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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1fd96f6b16fb75251f7bb4416ca21c40aec1cedacf93769e9197a8ece9e297a' 
  AND token = 'd35epUBhMuG9o4ZBMha1svKaW6dn4KN0mIJiPp29Pm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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