SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf9217362594250350d0f58eeba8147f7507c439cf82780841b1768cd3f237a' 
  AND token = 'q2PkgY3IZKC+zXztGnOwtBxXuGQY2c9KlDaFlR6XEKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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