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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f1ae9500c13cda982ea38a6cea4e5c60d2d5b02799f6eb54434fa3ea7fae69' 
  AND token = 'dwt97f4cLhPj54qRVP7ndkDlJlaxO/U+XqGNMv65XA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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