SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da4375c53e1f856d7e0e9362f5fc2f49ccf59b9515bf11614a9a83b7d0302b2' 
  AND token = 'yKceDzqIi8o8RmT6wY5WX+Wis+Yz8hjmlJaNAj+PLDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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