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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf5d2db3b59b9c6155ae719b6936fcce79322681883db859c1a486bf979c6e2' 
  AND token = '8Irq0RPXd/gzB5V9wYmZfa1oGPqrfXLS2cxxyOiDbcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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