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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ff56d332951a756f32d05fedb54969855710192954e9b665e44227e538bbe' 
  AND token = 'louYM0iSRzWUd3oLS5TWOOL8dm6fUc6WDPcTiNRMLUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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