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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c0d6452ec386a01a5f1fca3d77c7a065f8633a0147ea764e72bb35fa1271fc' 
  AND token = 'ZRKzL3uTTsAn3g2RvPkZMf7VIYT1knkd0FVM/erMGp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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