SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76418987a144836c37562f11e5196b6e1f3b214d9fddf4e24a01c94bbc967ff8' 
  AND token = '/ZZjsUr0BcPutcQh0sGOiz+xY5JqF4R6RnyL3KfAIiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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