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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6796117c5131f963078d996f738a53c34d82c334d7a44120c0d47d2231ef1888' 
  AND token = 'sIgeQ3mEl754ITKUivh+KoFit/77bNkShO6eNVzOv2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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