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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2b0eccbecd2d7763d600c83256d2273530fea5d1a0505bd6a2788322ac4e43' 
  AND token = '5wFgAmXJqrj7+HU2aV9es9utcQ8XfpXqdOAnIsE9eyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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