SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a8f247d1be8fe324fd2aab2c72b09ddd793965d2a7203edbc9c69cce00a202a' 
  AND token = 'y3knn+vzBqfZgvTGmmTjsNwZa5mSaFGxO/xBQKV4u1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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