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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa3bfbf9a58b8f9818c420a5622ccc98294540f41d76d992c71d123069d202e' 
  AND token = '6Gk84o8hgUJjC0M1Q46ojU9AXrBE09elvbLQ+ZGbMxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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