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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6478dd8133c5611a7920faa6e8e105460beffbdf3a06bc310718eba5e55e5c' 
  AND token = 'yXVXSU+dxOU0nwsBQLIVviv4oXbiT46bhUmEE4a+ev4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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