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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c18d4b0f639d12d058ea9187d38f2bd8938005fa3732f343a8f9e26cfad481b' 
  AND token = '6HaOZMj99EjHOy1KkP8v8OYhOZ01oP9ZXTbIzHwkeVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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