SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cda24f528f8189e0192080a3a9f4f2cc35145ef88b529cbf440d9c9a6db5a24' 
  AND token = 'Z5VclJ5RAoF9hYs4mblX2+SP4o/UKVEruozMRpWwYJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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