SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80192f0419dfb67c6601d098627ece1278b4c664fde02938f65ba35bcbe035a1' 
  AND token = 'uFY3KhAVbdHMJsVZDbUzcakh21+QzpZDFWpXKRVIw08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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