SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3835cf075f2d28a3e34b44f1dcbbdcf693a229ab7b1514d49b4bd29139896f99' 
  AND token = 'yOasOzC0sBlnFeGFNuaHw9Tqz2sIo/j2sw0WRRgQiqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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