SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bda714fc1369a16effd5692b1f262ff5cc9cfadaf2741316b2f156f0a68d46' 
  AND token = 'mpqdzX5gHqr58lWxlvZj3A9QDqhIQhijg4Lp8N97S8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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