SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97280f5adfce7716e64b3ac0df90095c2f8295d9e2492eaa197c6e6c05be3a0d' 
  AND token = 'HYJdwG2WAV7RHPP0HGvFwIJOIVFMp+saOwBvStGCgjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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