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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29cb2c2f4a8c25d92bfb58e0dead2b24d96b22bb77e2d3364fa4e306ba8c8b99' 
  AND token = '+whQA/mtzbh65oAbls9kzy4vjomMLkNhDZUKMzKdvVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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