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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a816355e8378ed987b8df4f572bef22060585981593f65d6e232c6d3ba3e935' 
  AND token = 'sXq53HfFj9CH1M4Y5vT7/QA662fH6jjjVu7pJMIuiJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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