SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f01c569ff332bae8b3bf256db1138b833663c950e2aadf58bd18023d3b49544' 
  AND token = '/iwEHVqNqyGc5jR8hZLccvK96D6ffrjN7uITx/b7JXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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