SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec795248506cf45883d076b5c4e52f1c94ff0a08821e42a4acb8bc3680d93c10' 
  AND token = 'Xpl8d9/F92fnX+IGZ9JBAptJ+o/hhwvjZA9u0wotNTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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