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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe4ba7ed14cd1cc0930200b49d086e9b659f8c0f3fc332e8c610ff80575820e' 
  AND token = 'PioHObUYVKEGVAY8wBAgojNetnbSmOETxjdEE6J7mYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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