SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94016fae2dda9ed30e275a4501b4c85239fa1936e5cf23b2f07d2f6f86176cfa' 
  AND token = '3Y32GuZ3gRUvOtV8P9BUW8HFtDIHy+W6u6rzlk9EC9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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