SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1cd3b4a4fa0f35f40bfaddf5b14029fd097494431a6ef7f5fa22ad24882837c' 
  AND token = '/JvCGCsEmzHOq0zdAMj3OoGvHXo1IGIBz/efVJZ6YuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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