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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e274f5d65b57c1ac9c4f4603418f338a53eb1b5fe402277d25ea37bca17b4a' 
  AND token = 'prFx1Al1E0lqNnEwrxf+A6oD904wl6nkSmwDrtJE320=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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