SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432fa41737a0219e48e3be8f4f8019e514b8369455a61717b9b70cc2cbac3537' 
  AND token = 'jvZ7nZrslq7/vpBjGtRvi6i9VYSTLD0joxM+kffx12g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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