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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed6ca70c044d7e00fcec8d9112845de15e0f3e1905fb04f5343ee229c587e47' 
  AND token = 'Ltmcjtm6hzms3bQXxyTr/Xlt3+ItUoGp9nwIuOqZnkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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