Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad42fd24d77ea153a41399d9d48b7ad7ed6c4e381ecb258c36574b0fffe6be9a' 
  AND token = '/TWXxQVf0kAIL0t2RPk3qw+JUWDs4V41/2JZ3uCAheY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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