SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125405efe022b9c3d5617d902a357bbfb74431281cd59b9295b9c4f33ddc2d4e' 
  AND token = 'Ymn+7NgYbzlIa7F2Bj0BVJyfquImkg3HbgUWvAwzeNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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