SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9795f13f6723f205442c6cc00c641e853c3c5abe0bf2cc4859cd258f9a46821' 
  AND token = '2rKVUzP7CJaYRfPP+DW/qPSsVcJ1bIo6KzZ/rSXl9T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00171

JSON explain

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