SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '226c46d695e963a8788b82f7c3e7e6d36f28836a8f88e5b378264853c170cabe' 
  AND token = 'vJkUWgmgn3xNWLHzqvDgvBGu8zZesRfd92sK/CfScJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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