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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995405cec8d9cb5901131c4580655d6ad271be760e5c8c5c40b5a74ab5a5b72e' 
  AND token = 'Usw83Dz+nvvcbM+Z3/CBT3k8TEu3dYHpxueymJ9WDlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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