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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bb9bb0328ea9188a7023fc3499b4e5a043d482067c60ee9bdaa5399b93e7ef' 
  AND token = 'YL6enVTKRrvarPG7eo5AjMxjPU/hav2o81CNzVIcPoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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