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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cfedd918cfb47d6ef50f0a60aab8230e9688f36493c891f64fc501665f61dd' 
  AND token = 'Ly0At3/58YmUSmJNv75pXHmWV+7/J6BRT0mMs8hRRr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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