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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7e91961e0e47b51840730b22eed1f14fddd9d7ea0dabf555e4c890aff389f4' 
  AND token = 'ZrUYHrAOn9Y2RAMNdATeRl9a9EoHJqloKek7YXSpKLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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