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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5997beb09cbb3f482cbdc9c9f083b65615515566c44f544301d4d31b4c8dc80d' 
  AND token = 'QXrG7Hq/Fx1V5EpOc3YoK9dwq1lVeg2AvgeK2V9W/TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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