SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fdb07c32cbe076bc2f65773140f9c6d4fa0004a5bd65f64ef544db5e024e35' 
  AND token = '8/n9+JVSAp9PgLPOwjJNagWsYM5BVEZM61KJ/zumoiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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