SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d18991051d2c35ed3c594e712d92af00384bb1edb5c9f3f6673bd9cc5f6d2ea' 
  AND token = 'TEQ/qFP0JnnnOxIq1MmJRawbbH5+BCzKM+hp8tp+VnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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