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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06233f92fd24e07654e4f7e986576489bfbc46d7ff4d1047fc2df67e16f8d4bd' 
  AND token = 'Vcc1H44+br778NgXsQXjCWE3gGtCar9RgvBOOVvngWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00160

JSON explain

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