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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4f0ee9eaf8f460927b0382b14b5faa81f73af67ab489f66210a92f887c6b8a' 
  AND token = 'GFxxEWh4hMyQXyhD+Hf5ZpK+nW4EqyEhwEhKbK/z+CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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