SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9fe339088bd1f1a036f3dd3833440f5c4a993f20b47879fd3e7ae3bc64748c9' 
  AND token = 'XZORvFp525DmCZAAflBjCtvPVyWsHFq8GQ8hN/nUtjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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