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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cfdfa17fbfe1bcc97a6bfbf7d7ac830b53cb6d1be3899f98d07c4ab67ec661' 
  AND token = 'xzyZdg+pcqGKcibhw6qj41ox78qTUVtgHM+erY3i0fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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