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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ac5cfcd0a96c324eff8d4b37c38efa0d76a1e94e266f509f0d56259f754766' 
  AND token = '/Qn+OdrQnN8cszT1W1ZtAqCLQrv1xUdT71ljJ6yHR8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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