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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4193d04fa39fba1f771f8afd7086a4612790536209a643352f03523fbb011413' 
  AND token = 'TDd+813YsDvKHwgjlipdqZ/qba8dKaUaJt6Ocv7KSts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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