Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51e192fb534167900f00269f761cc0db48c39f1b7a3dab57254096f69fab759d' 
  AND token = 'Ekh9IcSPprRahaxNaOXQbLD2vDV5j8F46/gFv9h6JVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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