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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696ca5940e0faea57a039056b6f299555c5822246370a3b6c7229fbaa717c849' 
  AND token = 'mHMvY4W41PtL24NkeAsNsGCs53i5p6JCfOFg4H6Zuwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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