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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79634dc5e67cf71f89ae85f672a2957a3ce866a3075cdf1b89ac176a90a2baa9' 
  AND token = 'hEvn00HIx6OdGET5iyKOuETyZfI2oJGzAO0gJ75+6d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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