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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c1456b82253630a3227718827efc706f625402ee3132065bff8ec95a5193ac7' 
  AND token = '1h45opJ/SbIjw4Jc9QHDf197DVjM1o9ERO6Joro9+Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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