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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95212c35cea92508e88677545f690682bc86fdc2b14eead27341d4d7fa642bb' 
  AND token = '9uZZha+fPFe6M3j55Nrudb+X4SwrLAulxUTw7WnOjXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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