Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81fb92f9e8511ebcfc2f9e2f4fe60ce4d96e713e9535fe21daa6145ce4aceb9' 
  AND token = '6lJrLtQA2uYXhzWLcOEloc2nR6zQOzf+rLzZVuM6zQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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