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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc3bf76992a10eadf21bbb2f79686be78103010b4afcb9f0d0e676f376d0a28' 
  AND token = 'lGo6keLiqa7llu7Zvcol5czpjFERBo4wjK+gjwIg/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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