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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee30fb3ddf352975d690471585f52bd058581855c802fd330d71752171f65e3' 
  AND token = 'dzgZ1Zbgjb3sBh7+mz9wWkCT2jiIbKyAuQkIuw8hAgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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