SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2a56723dcc2a93f4cd42bf766c15293f9e08b83c2547f2378bfdf722e6f120' 
  AND token = 'PV529veWtU7B/RCk/8yAvLZKhl5d46MM1lZHqu1/syY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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