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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92158fc73e4fcc8452e20b0f365c7b72c89eb3e7bad2ac4e2d6d7352d9e604ad' 
  AND token = 'DpUQq7XKA01RsnWdFfUdYLukV2g36EQHc9nB6GEV3b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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