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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae70f736929c935e70578b743c4fade44e72c3f54c95575cdc9babf9c7db0ee' 
  AND token = 'qw70vNXqO1yxuKx5nRqGscVIyhTIczJhtW0wasGbTno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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