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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13caeda915184fbb229563147cfee146390ae45fc8a8d10ecbb78c230b4358e1' 
  AND token = 'SlkQqR9s9gcSO42urRZhTeq21ZHlFP3r6hX1YIG2tfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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