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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d56124c16483ae57828ccb81f09b428437f1e05518a24c9c81b6e7bd735a20f' 
  AND token = 'rFqh5PTrKUYeD+7caqr15B6ba/9EjdunF1aMkbp/6E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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