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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc60f81f13ea2bcb0bd6a7a27cd0a8fb6249db147bd8f37c2f684d7e192c3b94' 
  AND token = 'c9GcO9JHtnazqFieaybyhz0VXtXjyto/f5HA13xC7SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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