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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dede706bff8dce831082a6c095ed342c90a8510236cae1fd16813be9791f726' 
  AND token = 'Tx9YldgQLDBwVJHQcfdXatYmndKb9KuUll7dNFL2CUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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