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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e513b1a42fb6a7c5fff6d2f7ba39677371620b1877af7b66bad561074cbc74' 
  AND token = 'yZmpXACQr40rFo98FB3wab9y05dekTvwMgPZ3/0YaiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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