SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c28c694b75ddfa6910f297ec248033f12d7c8b40b2effa4b56f652a4c94504' 
  AND token = '7J1TasvfxaglVKqGtunyyZ7AMXqUh6ZzKAPtueDZpJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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