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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a4c63d528d28fee9e354152b462660963b610d7c639efafc9dc4551080c52d' 
  AND token = 'iBpYmR3DmNYZ536j1aifqrPI2bjrzauV+AaYp1gFZUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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