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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de362ed6b87480d6acacb470afb1a9629ab29937de27c86d3f7c12d73651a24e' 
  AND token = '3txs9WvyVDUM0lkbtm+HUiLqzcQo0VZTIrl708b+eiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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