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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a9fe477278e85fbe9774fda769df47ed1cf78fc1fc4ca1a6f6f81ea16d3d65' 
  AND token = 'aAiQAdDJ0zI6smSYj3H9b1byN7z5znueQBBIAuHqBtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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