SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7325c26aa0c441856cb8f6cfd99914b32d9990b37b49e38af0388a56bf31a67f' 
  AND token = 'vhkVUxRS1uPsewPEG/sWXhfhbitrq62HaDBIJPDAsbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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