SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44abd25261b8aff408b847dafa610474bc7204e7b37ff5d9010e768635e30d9b' 
  AND token = 'bGPmYWh/WdvNX6gRcjxz8ms6P8IWKi8d+yZD0qGRbX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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