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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4210996bd748362037e335c548b13dff13ee18ed25b469443777eccfbfd700e' 
  AND token = '2a807Cke3V31L8Vfoqp7cBrVFx8m9U8aINsAG/S6AQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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