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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '030825439e221d7eaf826e421da6a7de0fa1f43a95bbcb5bb2a8a85306e15754' 
  AND token = 'kHvxR/Nd7DDdpony4ZNsoZxEkrIazTUOWeW/BouhRmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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