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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ba9123bada8266c02e0b062e763fe64c772a78ed00408f35a9d3b97775c169' 
  AND token = '6BStJXI6WkFKBPvXGyJ6ZFLf8a/HCw/9sE52XhweLH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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