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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afaebaa23f79851f65de74e85eb8c168c39b16e2ad83d8f18931f2ab0c05fa0' 
  AND token = 'fVphP6LycUe+88JnZuVbbb04KXOcSSxsiryg20ogqmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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