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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532cb3ac952d62bd2348d838bb99f41314f1a9a9b34aeb77ab56f978d84f33ad' 
  AND token = 'w9yrIouo/aSSLNu4HCzYd0T2JIVa8IFIppcF5JRUDuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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