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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0af8d1db933c76dadfb11bb872d0cb40edc22f1885d6cce137bb1e3aa4b34df' 
  AND token = 'DbeD2HWyAshmhkUiRIdK14dIrgve6+WTDF5kuIX9VwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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