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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d0d417555a876a17631e03324ce0e2494f1ea723b0a937a8bd5b8168794cd2' 
  AND token = 'pIZVWJ1k3rc9Ft8eRFwNg4tDQ+3TQExUuEBD1drzp1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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