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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf37df2bd951a0042363f1d3d124b9ef860dd61ad9ce331d942bbe06563ad2f4' 
  AND token = 'g7a9Ny4qUwTZlyJ8hycENteV8g6JyyB3RIPmiEGn2CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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