SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807a033ccc98330dd689be85761276b99c2f40d2ee50bf7d614fc94917b563ae' 
  AND token = 'VGROLP8Bt1DTmMtYEwhp2qYJZnTiUVXil7fc94aze8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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