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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50521a692d2f3b8b65bc1cbe12afa644a261f68ab2794c82a85feb6ba41680c' 
  AND token = 'pi+2oEgO9Nvx5ZsDOyadqnAH+XyliaQK8hQe7f2ifEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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