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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725a8d5a23e952e997e654c3ae70dc787352811782057b89c48d398dcf22024c' 
  AND token = '8VwhiOQLPBkLkhoP9qCXfBwqUQet92mtUfDEdp5WRRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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