SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc95682b398857218fe6bd070253a585e64bc1fda861059f53b3dfeb6f5e7d6' 
  AND token = 'hUat5Uv9N4xJm/WDk8EruHijzKwkf1CAgVx9fLQKbJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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