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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b49ea570417e83811d83a4ee8365a7dc39d24b6551b8b8d2ec10aced2bf70a18' 
  AND token = 'yxqg3Z40eiLYdE+8fv7/NiDWxwWrYNApWAo7TvuSjak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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